Your next step would be to pull the pump out. And get a 5 gallon bucket of water. And then stick the pumps inlet hose into the bucket. And hook it up to a battery and see if it pumps or not.
If it does, then you are clogged and you will have to work on flushing the system out. But if your not pumping, then the pump is simply dead.
Now, depending on who makes the pump, some of them are serviceable, and they have rubber impellers in them that do burn out over time. Jabsco pumps are rebuildable.
But other pumps are more like bilge pump pumps, and just plastic throwaway cheapies.
So those are your next steps. Pull the pump and and see if it pumps or not. And if not, research the pump to see if it is rebuildable or not.
That should just about do it here. Obviously I am not there to do this work for you, but I do want to make sure you are happy with me and the answers I give you here before doing the rating. If you have a further question on this, by all means feel free to fire away. If not, please let me know if the ratings box gives you any troubles.
Thanks in advance, and good luck!